A small box that sits on top of your stove that has a built in fan and a sensor. When you put your spoon under it the fan automaticly blows on it , to cool it off. The deluxe model could have digital temperature settings or a counter for those watching their diet.

Personally, I just keep my tasting spoon in a jug of cold water. There are possibilities here, though, but I don't think you're thinking big enough. I'd prefer some modification to the actual spoon; perhaps a Peltier device embedded in the bowl?